Characteristics of Karst Brecciated Carbonate of Carboniferous Huanglong Formation in the Eastern Sichuan Basin
详细信息
- 责任者：Zhu Zhipeng (School of Resources and Environmental Engineering ; Southwest Petroleum University ; Chengdu 610500 ; China) ; Huang Yong
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(5)
- 关键词：碳酸盐岩储集层 ; carbonate reservoirs ; 储层性质 ; reservoir properties ; 四川盆地 ; Sichuan Basin
- 页码：p.40-45
- 图表：illus., 2 tables, 19 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
Brecciated carbonates were widely developed in the upper Carboniferous Huanglong Formation of the eastern Sichuan Basin,and they include two main types: penecontemporaneous brecciated carbonates and karst brecciated carbonates.In order to effectively distinguish the said two types of brecciated carbonates and recognize diagenesis evolution of reservoirs,this study focuses on the characteristics of the latter type.Therefore,all types of data were first collected in this study area: the observation and description of core samples from 89 wells,well logging interpretation,and carbon and oxygen stable isotopes.On this basis,an in-deep investigation was then made into the characteristics of karst brecciated carbonates in the Huanglong Formation.a.The karst brecciated carbonates can be further divided into slacktip packing type,transport packing type and crack-corrosion type,and the second type is the dominant one confined to the upper and middle parts of the Huanglong Formation.b.There is a big difference in the features of carbon and oxygen isotopes between matrix and breccia: compared to the impure matrix,there filled in breccia with muddy,argillaceous,or argilloferruginuous carbonate cement.c.The karst brecciated carbonates presents a high gamma ray value and low resistivity.Finally,through a comparative study of the said three types of karst brecciated carbonates in this study area,the following findings were concluded: The slacktip packing type brecciated dolomites are rather thick but is only distributed in a limited area,thus are not favorable reservoirs;the transport packing type brecciated dolomites are much thinner,but some of them can be possibly developed as favorable reservoirs through water dissolution;the crack-corrosion type brecciated dolomites are most favorable reservoirs with developed corroded pores and fissures but distributed in a small area.
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